Piston-rod packing and packing-case.



No.724,022. PATENTED MAR.31,'1903.

J. H. LEWIS & L. G. KUNZBR.

PISTON ROD PACI HNG AND PACKING CASE. APPLICATION rum) NOV. 10, 1902.

d fizg \Il l d J UNITED STATES ATENT QFFICE.

JOHN'H. LEWIS AND ouis e. KUNZER, OF CHICAGO, ILLINOIS.

\ PISTON-ROD PACKING ANDPACKING-CASE.

SPECIFICATION forming part of Letters Patent No. 724,022, dated March31, I903. Application filed Novemberlq, 1902. Serial No. 130,636. (Nomodel.)

and packing-cases for piston-rods, and is specially designed forlocomotivepistons, which in practical use have more or less vibration,especially in rapid running of the locomotive over unsmooth tracks,though our invention is suitable for use upon other pistons.

The object of our invention is to provide a metallic packing andpacking-case of a cheap, simple, and durable construction, which may bequickly and conveniently applied, either to straight pistons or thosehaving enlarged cross-heads, and which will be steam-tight and efficientin operation and which will provide for the necessary vibration of thepiston-rod when in use.

Our invention consists in the means we employ to practically accomplishthis object orresult -that is to say, it consists, in connection withthe piston-rod and cylinder-head through which the piston reciprocatesand a case and follower having tapering or wedging faces to bear againstthe interposed packing, of a segmental metallic packing of Babbitt orother metal provided with a series or plurality of interfitting tonguesand grooves at the. meeting ends of the segments, suflicient play beingleft between the ends of thetongues,

and the bottom or ends of the grooves to allow for the Wear andcompression of the packing. The segmental interfitting tongue-andgroovepacking is preferably made in three segments, though the number of thesegments may be varied.

Our invention also consists, in combination with.the packing, of adivided or two-part follower and a divided or twopart case, each havingwedging or tapering exterior faces in connection with solid clampingrings or 001- lars having corresponding wedging or. tapering interiorfaces which encircle and bear against the follower and case, thusenabling the packing, follower, and case to be very quickly and readilyapplied to piston rods having enlargements, as well as to smooth pistensor pistons without such enlargements.

.Our' invention also consists in the novel construction of parts anddevices and in the novel combinations of parts and devices herein shownor described.

In the accompanying drawings, forming a part of this specification,Figure 1 is a vertical section of a piston-rod packing and glandembodying our invention. Fig. 2 is a crosssection on line 2 2 of Fig. 1.Fig. 3 is a detailelevation of the packing. Fig. 4 is a detail elevationof one of the segments of the packing, and Fig. 5 illustrates amodification in whichthe interfitting tongues and grooves are staggeredor arranged zigzag across the packing.

In said drawings, A represents the pistonrod, and .B a portion of thecylinder-head through which it reciprocates,-and O is the packing glandor collar by which the packing as a whole is secured to 'andconfined inthe opening or chamber 1) in the cylinder-head, said gland orcollar 0being firmly secured to the cylinder-head by threadedbolts C, havingnuts 0 D is our improved segmental metallic packing, the same beingpreferably composed of three segments, each of which is provided with aseries of interfitting' tongues and grooves d d at their meetingends,.so that the tongues (Z,fitting in the grooves d,lap by each other,and thus form a continuous packing all around the piston-rod. Thetongues d do not reach to the bottom or end of the groove 02, so as toallow for wear and compression of the packing. After the packing becomesso worn and compressed that'the ends d of the tongues abut against theshoulders or bottoms 01 of the grooves the packing can be readily andcheaply repaired for further use by simply cutting or grinding oif theends of the tongues d, thus making the same shorter.

- As illustrated in Fig. 5, the interfitting tongues and grooves (1 clare staggered or arranged zigzag, so that the vacant spaces cl betweenthe ends of the tongues and the bottoms of the grooves will not come inthe same line transversely across the packing, which in some respects isa preferable form, though not quite so convenient for repairing orshortening the tongues. The packing D has at its outer end a tapering,curved, or wedging face (1 to bear against the corresponding taperingface f of the case F, and at its opposite end it has a tapering orwedging face 01 to bear against the corresponding tapering or wedgingface 9 of the follower G.

To enable the packing D, case F, and follower G to be readily andquickly applied, especially to piston-rods having enlargements athereon, we employ a divided or two-part case F and a divided ortwo-part follower G. The divided or two-part case F has a tapering orwedging exterior face f to receive the solid clamping ring or collar F,which has a corresponding tapering or wedging interior face f and inlike manner the divided or two-part follower G has a tapering or wedging exterior face 9' to receive the solid clamping ring or collar G, whichhas a corresponding tapering or wedging interior face 9 To cause thesegments or parts of the case F to properly register with each other,the same are furnished with dowel-pins f at their meeting ends, and thetwo parts or segments of the follower G are likewise furnished withdowel-pins g to cause the same to register with each other. The case Fhas an exterior flange or shoulderf tolimit the inward movement of theclamping-ring F thereon, and the follower G has an exterior flange orshoulder 9 for the conical-faced clamping-ring G to abut against. Toprovide for the slight rocking or vibratory movement of the pistonrod,due to the jolting of the locomotive, we provide the clamping-ring Fwith a slightlybeveled outer face f against which fits a ring K, havinga correspondingly-beveled inner face 75, and which ring K is interposedbetween the flange C of the packing gland or collar 0 and saidclamping-ring F.

M is the spring, which acts against the follower G or its clamping-ringG and'serves to compress the packing and take up the Wear. The inner endof this spring bears against a shoulder 11 at the end of the chamber binthe cylinder-head B,a two-part bearing-ring being interposed.

The packing gland or collar 0 may preferably be divided or made in twoparts, as this facilitates'its application to the cylinder-head bracingsaid follower and having a tapering or wedging interior face, a springinterposed between said follower and the cylinder-head, a metallicsegmental. packing interposed between said case and follower andhavinginterfitting tongues and' grooves at the meeting ends of itssegments, a two-part or divided and flanged packing gland or collarsecured to the cylinder-head, and a ring interposed between the flangeof said gland or collar and the clamping-ring surrounding the case, saidinterposed ring and clamping-ring having beveled meeting faces,substantially as specified.

2. A metallic piston-rod packing, comprising a plurality of segments,having a plurality of interfitting tongues and grooves at their meetingends, said packing having ta= perin g or wedging faces at the endsthereof, and a case and follower each having tapering or wedgingbearing-faces engaging said tapering or wedging faces of the packing,substantially as specified.

3. The combination with a piston-rod and cylinder-head, of a segmentalmetallic packing having interfitting tongues'at the meet ing ends of itssegments, and a divided or two-part case having an exterior taperingface and a clamp-ring F having an interior tapering face, substantiallyas specified.

4:- The combination with a piston-rod and cylinder-head, of a segmentalmetallic packing having interfitting tongues at the meet ing ends of itssegments, a divided or twopart case, and a divided or two-part follower,substantially as specified.

5. The combination with a piston-rod and cylinder-head, of a segmentalmetallic pack ing having interfitting tongues at the meeting ends of itssegments, a divided or two-part case, and a clamping-ring embracing saidcase, substantially as specified.

6. The combination with a piston-rod and cylinder-head, of a segmentalmetallic packing having interfitting tongues at the meeting ends of itssegments, a divided or twopart case, a clamping-ring embracing saidcase, a divided or two-part follower, and a clamping-ring embracing saidfollower, sub stantially as specified.

7. The combination with a piston-rod and cylinder-head, of a segmentalmetallic packing, a divided or two-part case having an exterior taperingface and aclamp-ring F having an interior tapering face and a divided ortwo-part gland, substantially as specified.

8. The combination with a piston-rod and cylinder-head, of apacking-ring, a case, a flanged packing gland or collar, there being abevel end bearing face or connection between the case and the packinggland or collar to provide for vibration of the piston-rod,substantially as specified.

9. The combination with a metallic packing, comprising a plurality ofsegments having interfitting tongues at their meeting ends, of a caseand a follower, a gland and rings interposed between the case and glandhaving-ring embracing the case having a beveled 10 end bearing-face toprovide for vibration of the piston-rod, substantially as specified.

JOHN H. LEWIS. LOUIS G. KUNZER.

Witnesses:

H. M. MUNDAY, EDMUND ADCOOK.

of a case and follower, said case and follower being divided and havingclamping-rings embracing the same and a gland, said clamp-

